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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAnimatedImage.h"
#include "SkCanvas.h"
#include "SkCodec.h"
#include "SkCodecPriv.h"
sk_sp<SkAnimatedImage> SkAnimatedImage::MakeFromCodec(std::unique_ptr<SkCodec> codec) {
if (!codec) {
return nullptr;
}
auto image = sk_sp<SkAnimatedImage>(new SkAnimatedImage(std::move(codec)));
if (!image->fActiveFrame.fBitmap.getPixels()) {
// tryAllocPixels failed.
return nullptr;
}
return image;
}
// Sentinel value for starting at the beginning.
static constexpr double kInit = -1.0;
SkAnimatedImage::SkAnimatedImage(std::unique_ptr<SkCodec> codec)
: fCodec(std::move(codec))
, fFinished(false)
, fRunning(false)
, fNowMS(kInit)
, fRemainingMS(kInit)
{
if (!fActiveFrame.fBitmap.tryAllocPixels(fCodec->getInfo())) {
return;
}
this->update(kInit);
}
SkAnimatedImage::~SkAnimatedImage() { }
SkRect SkAnimatedImage::onGetBounds() {
return SkRect::Make(fCodec->getInfo().bounds());
}
void SkAnimatedImage::onDraw(SkCanvas* canvas) {
canvas->drawBitmap(fActiveFrame.fBitmap, 0, 0);
}
SkAnimatedImage::Frame::Frame()
: fIndex(SkCodec::kNone)
{}
bool SkAnimatedImage::Frame::copyTo(Frame* dst) const {
if (dst->fBitmap.getPixels()) {
dst->fBitmap.setAlphaType(fBitmap.alphaType());
} else if (!dst->fBitmap.tryAllocPixels(fBitmap.info())) {
return false;
}
memcpy(dst->fBitmap.getPixels(), fBitmap.getPixels(), fBitmap.computeByteSize());
dst->fIndex = fIndex;
dst->fDisposalMethod = fDisposalMethod;
return true;
}
void SkAnimatedImage::start() {
fRunning = true;
}
void SkAnimatedImage::stop() {
fRunning = false;
}
void SkAnimatedImage::reset() {
this->update(kInit);
}
static bool is_restore_previous(SkCodecAnimation::DisposalMethod dispose) {
return SkCodecAnimation::DisposalMethod::kRestorePrevious == dispose;
}
double SkAnimatedImage::update(double msecs) {
if (fFinished) {
return std::numeric_limits<double>::max();
}
const double lastUpdateMS = fNowMS;
fNowMS = msecs;
const double msSinceLastUpdate = fNowMS - lastUpdateMS;
const int frameCount = fCodec->getFrameCount();
int frameToDecode = SkCodec::kNone;
if (kInit == msecs) {
frameToDecode = 0;
} else {
if (!fRunning || lastUpdateMS == kInit) {
return kInit;
}
if (msSinceLastUpdate < fRemainingMS) {
fRemainingMS -= msSinceLastUpdate;
return fRemainingMS + fNowMS;
} else {
frameToDecode = (fActiveFrame.fIndex + 1) % frameCount;
}
}
SkCodec::FrameInfo frameInfo;
if (fCodec->getFrameInfo(frameToDecode, &frameInfo)) {
if (!frameInfo.fFullyReceived) {
SkCodecPrintf("Frame %i not fully received\n", frameToDecode);
fFinished = true;
return std::numeric_limits<double>::max();
}
if (kInit == msecs) {
fRemainingMS = frameInfo.fDuration;
} else {
// Check to see whether we should skip this frame.
double pastUpdate = msSinceLastUpdate - fRemainingMS;
while (pastUpdate >= frameInfo.fDuration) {
SkCodecPrintf("Skipping frame %i\n", frameToDecode);
pastUpdate -= frameInfo.fDuration;
frameToDecode = (frameToDecode + 1) % frameCount;
if (!fCodec->getFrameInfo(frameToDecode, &frameInfo)) {
SkCodecPrintf("Could not getFrameInfo for frame %i",
frameToDecode);
// Prior call to getFrameInfo succeeded, so use that one.
frameToDecode--;
fFinished = true;
if (frameToDecode < 0) {
return std::numeric_limits<double>::max();
}
}
}
fRemainingMS = frameInfo.fDuration - pastUpdate;
}
} else {
fFinished = true;
if (0 == frameToDecode) {
// Static image. This is okay.
frameInfo.fRequiredFrame = SkCodec::kNone;
frameInfo.fAlphaType = fCodec->getInfo().alphaType();
// These fields won't be read.
frameInfo.fDuration = INT_MAX;
frameInfo.fFullyReceived = true;
} else {
SkCodecPrintf("Error getting frameInfo for frame %i\n",
frameToDecode);
return std::numeric_limits<double>::max();
}
}
if (frameToDecode == fActiveFrame.fIndex) {
return fRemainingMS + fNowMS;
}
if (frameToDecode == fRestoreFrame.fIndex) {
SkTSwap(fActiveFrame, fRestoreFrame);
return fRemainingMS + fNowMS;
}
// The following code makes an effort to avoid overwriting a frame that will
// be used again. If frame |i| is_restore_previous, frame |i+1| will not
// depend on frame |i|, so do not overwrite frame |i-1|, which may be needed
// for frame |i+1|.
// We could be even smarter about which frames to save by looking at the
// entire dependency chain.
SkCodec::Options options;
options.fFrameIndex = frameToDecode;
if (frameInfo.fRequiredFrame == SkCodec::kNone) {
if (is_restore_previous(frameInfo.fDisposalMethod)) {
// frameToDecode will be discarded immediately after drawing, so
// do not overwrite a frame which could possibly be used in the
// future.
if (fActiveFrame.fIndex != SkCodec::kNone &&
!is_restore_previous(fActiveFrame.fDisposalMethod)) {
SkTSwap(fActiveFrame, fRestoreFrame);
}
}
} else {
auto validPriorFrame = [&frameInfo, &frameToDecode](const Frame& frame) {
if (SkCodec::kNone == frame.fIndex || is_restore_previous(frame.fDisposalMethod)) {
return false;
}
return frame.fIndex >= frameInfo.fRequiredFrame && frame.fIndex < frameToDecode;
};
if (validPriorFrame(fActiveFrame)) {
if (is_restore_previous(frameInfo.fDisposalMethod)) {
// fActiveFrame is a good frame to use for this one, but we
// don't want to overwrite it.
fActiveFrame.copyTo(&fRestoreFrame);
}
options.fPriorFrame = fActiveFrame.fIndex;
} else if (validPriorFrame(fRestoreFrame)) {
if (!is_restore_previous(frameInfo.fDisposalMethod)) {
SkTSwap(fActiveFrame, fRestoreFrame);
} else if (!fRestoreFrame.copyTo(&fActiveFrame)) {
SkCodecPrintf("Failed to restore frame\n");
fFinished = true;
return std::numeric_limits<double>::max();
}
options.fPriorFrame = fActiveFrame.fIndex;
}
}
auto alphaType = kOpaque_SkAlphaType == frameInfo.fAlphaType ?
kOpaque_SkAlphaType : kPremul_SkAlphaType;
SkBitmap* dst = &fActiveFrame.fBitmap;
if (dst->getPixels()) {
SkAssertResult(dst->setAlphaType(alphaType));
} else {
auto info = fCodec->getInfo().makeAlphaType(alphaType);
if (!dst->tryAllocPixels(info)) {
fFinished = true;
return std::numeric_limits<double>::max();
}
}
auto result = fCodec->getPixels(dst->info(), dst->getPixels(), dst->rowBytes(), &options);
if (result != SkCodec::kSuccess) {
SkCodecPrintf("error %i, frame %i of %i\n", result, frameToDecode, fCodec->getFrameCount());
// Reset to the beginning.
fActiveFrame.fIndex = SkCodec::kNone;
return 0.0;
}
fActiveFrame.fIndex = frameToDecode;
fActiveFrame.fDisposalMethod = frameInfo.fDisposalMethod;
return fRemainingMS + fNowMS;
}
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